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Freely Deformable Liquid Metal Grids as Stretchable and Transparent Electrodes
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- Authors
- Yu Gyeong Moon, Jae Bon Koo, Nae-Man Park, Ji-Young Oh, Bock Soon Na, Sang Seok Lee, Seong-Deok Ahn, Chan Woo Park
- Issue Date
- 2017-12
- Citation
- IEEE Transactions on Electron Devices, v.64, no.12, pp.5157-5162
- ISSN
- 0018-9383
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- A new structure of stretchable and transparent metal-grid electrodes is described, where a liquid metal alloy, eutectic gallium-indium (EGaIn) is employed as a stretchable conducting material. By a 'roll-painting and lift-off' technique based on photolithography, stretchable EGaIn-grids with the linewidth of 20 μm and the line pitch of 400-1000 μm are produced, providing the transmittance of 75%-88% with the sheet resistance less than 2.3 廓 square. Powered by the freely deformable nature of the liquid phase conductor, the EGaIn-grid provides stable conductivity under highly stretched condition up to 40%, as well as high reliability against cyclic deformation. By combining the EGaIn-grid with a homogeneous and transparent poly(3,4-thylenedioxythiophene):poly(styrensulfonate) (PEDOT:PSS) layer in a hybrid manner, we can construct highly stretchable and uniformly conducting transparent electrodes. The hybrid PEDOT:PSS/EGaIn-grid electrodes can be utilized as electrodes for a stretchable inorganic electroluminescence device with a ZnS phosphor-elastomer composite as the emission layer, which maintains uniform and stable emission under highly and repeatedly stretched conditions.
- KSP Keywords
- Conducting materials, Elastomer composite, High Reliability, Line pitch, Liquid metal alloy, Metal grids, ZnS phosphor, cyclic deformation, eutectic gallium-indium, highly stretchable, lift-off